On Saturday, China registered 45 new cases of coronavirus on the mainland - down from 54 on the previous day - with all but one involving overseas travelers, the health authority of the country said on Sunday.

China has registered 313 imported cases of coronavirus in the last seven days but only 6 confirmed cases of domestic transmission, National Health Commission data shows.

Five new deaths were also confirmed by China on Saturday, all of which were in Wuhan, Hubei province, where the COVID-19 respiratory disease was first detected. A total of 3,300 people have already died in mainland China, with 81,439 infections recorded.

Saturday marked the fourth consecutive day in which no new reported cases were registered in the Hubei province. Henan province, bordering Hubei, reported the sole case of domestically transmitted coronavirus.

With traffic restrictions lifted in the province, Wuhan is also slowly reopening borders and restarting other local transport services.

Johns Hopkins University data showed that both the United States and Italy have outstripped China in terms of the number of cases registered.

China aims to take further measures to revive a coronavirus-hit economy, as the nation registered no new local infections for the previous day on Saturday.

The Politburo of the ruling Communist Party disclosed that it would fast-track changes to its macroeconomic strategy and seek more aggressive fiscal measures, the state media announced.

With the world's second-biggest economy forecast to contract this quarter for the first time in 40 years, the country is now poised to roll out a stimulus package worth hundreds of billions of dollars.

The Politburo called for an expansion of the budget shortfall, more local and national equities released, lower interest rates driven, loan repayments postponed, supply chain bottlenecks reduced and consumption boosted.

After more than two months of isolation, Wuhan partially re-opened. Passenger crowds arriving at Wuhan train station on Saturday were seen. According to reports people are permitted to enter but not exit.

On Sunday, all Hubei airports resumed some domestic flights, with the exception of Wuhan's Tianhe airport, which will be open to domestic flights on April 8. Flights to Beijing from Hubei remain suspended.

China has declared a temporary ban on all international tourists as it struggles to monitor cases coming from outside, even though they have visas or residency permits. This also limits Chinese and international airlines to one flight a week, and flights must not be more than 75 percent complete.